cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

mpp.c (2038B)

      1/*
      2 * arch/arm/plat-orion/mpp.c
      3 *
      4 * MPP functions for Marvell orion SoCs
      5 *
      6 * This file is licensed under the terms of the GNU General Public
      7 * License version 2.  This program is licensed "as is" without any
      8 * warranty of any kind, whether express or implied.
      9 */
     10
     11#include <linux/kernel.h>
     12#include <linux/init.h>
     13#include <linux/mbus.h>
     14#include <linux/io.h>
     15#include <linux/gpio.h>
     16#include <plat/orion-gpio.h>
     17#include <plat/mpp.h>
     18
     19/* Address of the ith MPP control register */
     20static __init void __iomem *mpp_ctrl_addr(unsigned int i,
     21					  void __iomem *dev_bus)
     22{
     23	return dev_bus + (i) * 4;
     24}
     25
     26
     27void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask,
     28			   unsigned int mpp_max, void __iomem *dev_bus)
     29{
     30	unsigned int mpp_nr_regs = (1 + mpp_max/8);
     31	u32 mpp_ctrl[8];
     32	int i;
     33
     34	printk(KERN_DEBUG "initial MPP regs:");
     35	if (mpp_nr_regs > ARRAY_SIZE(mpp_ctrl)) {
     36		printk(KERN_ERR "orion_mpp_conf: invalid mpp_max\n");
     37		return;
     38	}
     39
     40	for (i = 0; i < mpp_nr_regs; i++) {
     41		mpp_ctrl[i] = readl(mpp_ctrl_addr(i, dev_bus));
     42		printk(" %08x", mpp_ctrl[i]);
     43	}
     44	printk("\n");
     45
     46	for ( ; *mpp_list; mpp_list++) {
     47		unsigned int num = MPP_NUM(*mpp_list);
     48		unsigned int sel = MPP_SEL(*mpp_list);
     49		int shift, gpio_mode;
     50
     51		if (num > mpp_max) {
     52			printk(KERN_ERR "orion_mpp_conf: invalid MPP "
     53					"number (%u)\n", num);
     54			continue;
     55		}
     56		if (variant_mask && !(*mpp_list & variant_mask)) {
     57			printk(KERN_WARNING
     58			       "orion_mpp_conf: requested MPP%u config "
     59			       "unavailable on this hardware\n", num);
     60			continue;
     61		}
     62
     63		shift = (num & 7) << 2;
     64		mpp_ctrl[num / 8] &= ~(0xf << shift);
     65		mpp_ctrl[num / 8] |= sel << shift;
     66
     67		gpio_mode = 0;
     68		if (*mpp_list & MPP_INPUT_MASK)
     69			gpio_mode |= GPIO_INPUT_OK;
     70		if (*mpp_list & MPP_OUTPUT_MASK)
     71			gpio_mode |= GPIO_OUTPUT_OK;
     72
     73		orion_gpio_set_valid(num, gpio_mode);
     74	}
     75
     76	printk(KERN_DEBUG "  final MPP regs:");
     77	for (i = 0; i < mpp_nr_regs; i++) {
     78		writel(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus));
     79		printk(" %08x", mpp_ctrl[i]);
     80	}
     81	printk("\n");
     82}